Least Significant Bit

Cool, that's a really useful example - thank you! Was looking at some "blink without delay" examples but this is cleaner and clearer. 10kHz is plenty fast. The gifs are made with Byzanz; a command line GIF screen recorder that does a really good job with optimisation. I usually grab whole screen and crop in Gimp, but you can specify a region too. Edit: What is this GCBasic - looks like C?

Cool, that's a really useful example - thank you! Was looking at some "blink without delay" examples but this is cleaner and clearer. 10kHz is plenty fast. The gifs are made with Byzanz; a command line GIF screen recorder that does a really good job with optimisation. I usually grab whole screen and crop in Gimp, but you can specify a region too.

No worries; I do not need to model the complete circuit, only the logic. I'm kinda new to Atmel C and trying to design a bi-colour LED matrix display, which to me is quite a challenge! I started by building a "proof of concept" in Python (with which I'm more famliar) and now need to port it to the AVR. I'm hoping SimulIDE will speed up the countless trial & error cycles which will be required. I have opted for a common row anode configuration, and row by row multiplexing; the low-side shift registers...

No worries; I do not need to model the complete circuit, only the logic. I'm kinda new to Atmel C and trying to design a bi-colour LED matrix display, which to me is quite a challenge! I started by building a "proof of concept" in Python (whith which I'm more famliar) and now need to port it to the AVR. I'm hoping SimulIDE will speed up the countless trial & error cycles which will be required. I have opted for a common row anode configuration, and row by row multiplexing; the low-side shift registers...

No worries; I do not need to model the complete circuit, only the logic. I'm kinda new to Atmel C and trying to design a bi-colour LED matrix display, which to me is quite a challenge! I started by building a "proof of concept" in Python (whith which I'm more famliar) and now need to port it to the AVR. I'm hoping SimulIDE will speed up the countless trial & error cycles which will be required. I have opted for a common row anode configuration, and row by row multiplexing; the low-side shift registers...

It's been a bit of a struggle, but seeing this makes me excited: I know the LED matrix needs drivers, but it's too fiddly to build these in SimulIDE; I tried adding a bunch of transistor driven mosfets but it slowed the simulation down to just 4% and with pull-ups etc it took up 5x as much screen space as the logic alone. Saying that, it's the AVR code I want to test, and SimulIDE is the only tool I know that will let me do this WYSIWYG and in "real time", so it's still quite useful!

Doh! I knew that (reset must be high), just getting a bit tired. Example works now. Going back to my own test now to see if I can make it go - useuful to have a working example to compare behvaiour!

Thanks Santiago - I found the 74HC595 example, but whatever I do I cannot get any output! Maybe broken in trunk somehow? Also, I thought OE was inverted? In the example the switch feeds it 5V - does that mean it's tied to GND when "off"? I've tried with OE both on and off and still nothing...